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[自然百科] 【整理】2008-05-19 Tornadoes 龙卷风的形成

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on  fionainnicemood

 

Call them twisters or tornadoes, they are  nature's  most violent storms with swirling winds that can top 300 miles per hour. About 800 twisters sweep through the US every year, more than anywhere else in the world. The hardest hit area is a swath of the Great Plains from Texas to South Dakota, known as Tornado Alley. Here warm air flows up from the Gulf of Mexico in the spring and summer and crashes into  cold air pushing down from Canada. The meeting produces violent thunderstorms called supercells.

 

Scientists don’t completely understand how or when tornadoes form, but they do know a supercell like this one can produce a twister if / conditions are right. As more moist air flows into a storm, it gets pushed up and twisted by upper level winds. As this rotating column of air gathers force, conditions are right for a collision below. When rain and  cool downdrafts hit warm air near the ground, a low hanging revolving cloud forms beneath the  cell. A tornado is imminent

 

Tornadoes don’t last long anywhere from 20 seconds to an hour, but it can take years to recover from the devastation. These storms kill nearly 90 people each year in the US, and cause millions of dollars worth of damage.

 

When a tornado is spotted, experts advise going /to a basement, staying away from any windows or climbing into a first floor bathtub.

 

While most people run for safety when a twister appears, some scientists actually race to meet it. These storm chasers hunt down tornadoes, trying to get right in the twisters' path. They encounter incredible cloud movement: torrential rain, severe winds and hail, lightening, breathtaking storm structures. When they finally locate/ a twister, they measure it using special tools. These scientists hope to someday predict exactly when and where tornadoes will strike.

 Little can prevent the damage caused by tornadoes, but better forecasting could save more lives, giving survivors the chance to rebuild after living through one of the most violent storms on earth.

[ 本帖最后由 fionainnicemood 于 2008-5-31 23:10 编辑 ]
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Call them twisters or tornadoes, the nature’s the most violent storms, with swirling winds, they can top 300 miles per hour. About 800 twisters sweep through the US every year, or than anywhere else in the world. The hardest-hit area is swathe of the Grand Plains from Texas to South Dakota, known as tornado valley. Here warm air flows up from the Gulf of Mexico in the Spring and Summer and crashes the cold air, pushing down from Canada. The meeting produces violent thunderstorms called Super Cells. Scientists don’t completely understand how or when tornadoes form. But they do know a super Cell like this one can produce a twister if the conditions are right. As *stair flow into a storm, it gets pushed up and twisted by upper level winds. As its rotating columns gathers force, conditions are right for **. When rain cool down **hit** near the ground, a low hanging revolving cloud forms near the cell.

 

A tornado is imminent. Tornadoes don’t last long, anywhere from 20 seconds to an hour. But it can take a year to recover devastation. Rain storms kill nearly 90 people each year in the US, and cause millions of dollars worthy of damage. When a tornado is spotted, experts advise going to a basement, staying away from any windows or climb into the 1st floor of *. While most people run for safety when the twister reappears, some scientists actually raise immediately, rain storm chasers hunt down the tornadoes, and right get into tornado’s path. They encounter incredible cloud movement, torrential rains, severe rain and hail, lightning and risk-taking storm structures. When they finally locate a twister, they measure using special tools. The scientists hope to someday predict when and where tornado will strike. Little can prevent the damage caused by tornadoes, but better forecasting could save more lives, giving survivors the chance to rebuild after living through one of the most violent storms on the earth.

 

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hw

 

Call them twisters or tornadoes, they are  nature's  most violent storms with swirling winds that can top 300 miles per hour. About 800 twisters sweep through the US every year, more than anywhere else in the world. The hardest hit area is a swath of the Great Plains from Texas to South Dakota, known as Tornado Alley. Here warm air flows up from the Gulf of Mexico in the spring and summer and crashes into  cold air pushing down from Canada. The meeting produces violent thunderstorms called supercells.

 

Scientists don’t completely understand how or when tornadoes form, but they do know a supercell like this one can produce a twister if  conditions are right. As more moist air flows into a storm, it gets pushed up and twisted by upper level winds. As this rotating column of air gathers force, conditions are right for a collision below. When rain and  cool downdrafts hit warm air near the ground, a low hanging revolving cloud forms beneath the  cell. A tornado is imminent

 

 

 

Tornadoes don’t last long anywhere from 20 seconds to an hour, but it can take years to recover from the devastation. These storms kill nearly 90 people each year in the US, and cause millions of dollars worth of damage.

 

When a tornado is spotted, experts advise going to a basement, staying away from any windows or climbing into a first floor bathtub.

 

While most people run for safety when a twister appears, some scientists actually race to meet it. These storm chasers hunt down tornadoes, trying to get right in the twisters' path. They encounter incredible cloud movement: torrential rain, severe winds and hail, lightening, breathtaking storm structures. When they finally locate a twister, they measure it using special tools. These scientists hope to someday predict exactly when and where tornadoes will strike.

 

Little can prevent the damage caused by tornadoes, but better forecasting could save more lives, giving survivors the chance to rebuild after living through one of the most violent storms on earth.

 

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hw

Call them twisters or tornadoes, they are  nature's  most violent storms with swirling winds that can top 300 miles per hour. About 800 twisters sweep through the US every year, more than anywhere else in the world. The hardest hit area is a swath of the Great Plains from Texas to South Dakota, known as Tornado Alley. Here warm air flows up from the Gulf of Mexico in the spring and summer and crashes into  cold air pushing down from Canada. The meeting produces violent thunderstorms called supercells.

 

Scientists don’t completely understand how or when tornadoes form, but they do know a supercell like this one can produce a twister if  conditions are right. As more moist air flows into a storm, it gets pushed up and twisted by upper level winds. As this rotating column of air gathers force, conditions are right for a collision below. When rain cool downdrafts hit warm air near the ground, a low hanging revolving cloud forms beneath the  cell. A tornado is imminent.

 

Tornadoes don’t last long anywhere from 20 seconds to an hour, but it can take years to recover from the devastation. These storms kill nearly 90 people each year in the US, and cause millions of dollars worth of damage.

 

When a tornado is spotted, experts advise going to a basement, staying away from any windows or climbing into a first floor bathtub.

 

While most people run for safety when a twister appears, some scientists actually race to meet it. These storm chasers hunt down tornadoes, trying to get right in the twisters' path. They encounter incredible cloud movement: torrential rain, severe winds and hail, lightening, breathtaking storm structures. When they finally locate a twister, they measure it using special tools. These scientists hope to someday predict exactly when and where tornadoes will strike.

 Little can prevent the damage caused by tornadoes, but better forecasting could save more lives, giving survivors the chance to rebuild after living through one of the most violent storms on earth.

[ 本帖最后由 fionainnicemood 于 2008-5-31 23:09 编辑 ]
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Call them twisters or tornadoes, the nature’s most violent storms with swirling winds that can top 300 miles per hour. About 800 twisters sweep through the US every year, more than anywhere else in the world. The hardest hit area is a swath of the Great Plains from Texas to South Dakota, known as Tornado Alley.

Here warm air flows up from the Gulf of Mexico in the spring and summer and crashes in the cold air, pushing down from Canada. The meeting produces violent thunderstorms called super cells. Scientists don’t completely understand how or when tornadoes form, but they do know a super cell like this one can produce a twister if conditions are right.

As warm moist there flows into a storm, it gets pushed up and twisted by upper level winds. As this rotating column of air gathers force, conditions are right for collision below. When rain cooled downdrafts hit warm air near the ground, a low-hanging revolving cloud forms beneath the cell. A tornado is imminent.

Tornadoes don’t last long anywhere from 20 seconds to an hour, but it can take years to recover from the devastation. These storms kill nearly 90 people each year in the U.S. and cause millions of dollars’ worth of damage.

When a tornado is spotted, experts advise going to a basement, staying away from any windows or climbing into a first floor bathtub.

When most people run for safety when a twister appears, some scientists actually raise to need it. These storm chasers hunt down tornadoes, trying to get right in the twister’s path. They encounter incredible cloud movement, torrential rain, severe winds and hail, lightening, breath-taking storm structures. When they finally locate a twister, they measure it with special tools.

The scientists hope to someday predict exactly when and where Tornados will strike. Little can prevent the damage caused by tornadoes, but better forecasting could save more lives, giving survivors the chance to rebuild after living through one of the most violent storms on earth.
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